After months of seemingly nonstop bad news surrounding the coronavirus pandemic, reports of two potential vaccines from Pfizer and Moderna offer a ray of hope. However, as the vaccines inch closer to a public rollout, they raise a number of questions: When will they become available? Who will get them first? And will you be able to choose which vaccine you receive? Yahoo News Medical Contributor Dr. Kavita Patel explains what the vaccines will mean for the long term — and why traditional prevention methods are still needed in the short term.